Meanwhile, bring a pot of water to a boil. Boil green beans for 1 minute, then transfer to a bowl filled with ice water to stop cooking process. Remove beans from water and set aside.

Heat oil in a large skillet over medium-high heat. Add onion and garlic to skillet, and cook until softened, about 4 minutes. Stir in tomatoes and cook until heated through.

Toss pasta, green beans, onion-tomato mixture, and feta together in a large bowl, then serve.

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